Jurnal Simetri Rekayasa

Sistem Pendeteksi Panas Kabel dan Peringatan Dini Pada Panel Surya Listrik Menggunakan Sensor Suhu

Ariq Muntasir Adha, Ahmad Yanie, Fajar Dwi Wiliyanto — Fri, 29 Apr 2022 00:00:00 +0000

Melting cable skin will short circuit current and cause fire. The factor that makes fires due to short circuits is that they are difficult to detect from the start. The purpose of this research is to design a protection and early warning system for electrical panels. The design method uses AVR ATmega 8 and also uses a C language program for system design. The result of this research is a thermal protection system on the conductor cable which is designed with an electronic circuit and is equipped with a thermal sensor, microcontroller, protection relay and display. Constant Value is 100 C/Volt. The LM 35 sensor converts temperature to voltage with a resolution of 10 mV / °C. With a thermal protection system on the cable, cable damage can be avoided and can also avoid fatal consequences such as melting cables and short circuits that can cause fires.

PENERAPAN GOOD MANUFACTURING PRACTICES DAN WORK IMPROVEMENT IN SMALL ENTERPRISES PADA PEMBUATAN OPAK DI UMKM DESI

Sat, 30 Apr 2022 00:00:00 +0000

Opak Desi UKM is an UKM engaged in producing opaque crackers made from sweet potatoes/cassava. However, the work environment in these SMEs still does not have a clean kitchen standard. This clean kitchen standard is known as the GMP rules (Good Manufacturing Practice). GMP is a guideline for how to produce food with the aim that producers meet the predetermined requirements to produce quality food products in accordance with consumer demands. The problem is that the production area in SMEs is less hygienic and uncomfortable for workers and the flow of materials that occur experience cross movement, which means they intersect and also occur double tracking which causes the production process to be hampered. This research was completed using the assessment of the GMP checklist to evaluate the overall work system. The results of the checklist assessment are processed using the AHP method. The results of the assessment show that the criteria for storage and material handling with a weight of 1.65658 for UKM Opak are work system improvement priorities. Some of the proposed recommendations for improving the work system are the design of the SSOP work system, GMP, and the design of a new layout adapted to food safety and hygiene standards. The recommendations are expected to be able to increase productivity in the production process as well as safer, healthier and more comfortable working conditions.

USULAN PERBAIKAN SISTEM MANAJEMEN KESELAMATAN KERJA MENGGUNAKAN METODE HAZARD IDENTIFICATION AND RISK ASSESMENT CONTROL (HIRAC) DI PT PERKEBUNAN NUSANTARA IV

Sat, 30 Apr 2022 00:00:00 +0000

Occupational Safety and Health (K3) protects the safety and health of employees in carrying out their work, and strives to control all forms of potential hazards that exist in the work environment of PT. The Tea Factory Unit of Nusantara Plantation, Tobasari Plantation, is part of PTPN IV which operates in the argo industry. The main product to be processed is the. PTPN IV Tobasari Tea Factory Unit is a very risky work environment. In the factory production process, it is also not far from risks such as large fires. During the production of PTPN IV, the Tobasari unit needed an occupational safety program to develop employee creativity so that the quality and production results of the company were good. The method used in this study was to use the Hazard Identification and Risk Assessment Control (HIRAC) method. Hazard Identification identifies potential hazards that may occur, and the next step is Risk Assessment Control, namely assessing risks based on likelihood and Severity. The results showed that there were 12 potential hazards identified and categorized in 3 risk ratings, of which 5% were included in high risk, 26% were in moderate risk, and 19% were in low risk.

Analisis Penyebab Repulping Dengan Metode Failure Mode And Effect Analysis (FMEA) Dan Fault Tree (FTA) Pada Departemen Fiberline Di PT. Toba Pulp Lestari, TBK

Sat, 30 Apr 2022 00:00:00 +0000

PT. Toba Pulp Lestari, Tbk is a company engaged in the pulp and kerta production business with domestic and foreign product marketing areas. PT. Toba Pulp Lestari, Tbk is one of Indonesia's largest pulp and paper producing companies. The purpose of this study is to determine the ability of the process based on existing off-grade products using the Failure Mode and Effect Analysis and Fault Tree Analysis methods to then control and analyze the causes of off-grade products and seek improvements. The results showed that there were 3 types of off-grade products: Low Brightness, Dirt Count, and Viscosity. From the calculation, the results were obtained that the largest off-grade products were X1 (viscosity) with a number of smallpox products as much as 167 tons with 26.95%, X2 (brightness) with a number of defective products with as much as 332 tons with 53.55%, and X3 (dirt count) with the number of defective products as much as 124 tons with 20%. From the FMEA results, the highest Risk Priority Number (RPN) value was obtained, namely 432 for the cause of failure due to irregular setting of the temperature and time of the digester and washing machine at Low Brightness failure. For continuous improvement, various aspects are carried out, namely human aspects, work environment, work methods, machines, and, materials.

ANALISIS POSTUR KERJA PADA OPERATOR PEMUAT BUAH DENGAN REBA DAN RULA DI BAGERPANG PALM OIL

Sat, 30 Apr 2022 00:00:00 +0000

PT. PP London Sumatra is a factory that processes oil palm fruit into Crude Palm Oil (CPO). Oil palm fruit that comes from plantations is re-sorted by the sorting operator based on the level of fruit maturity. This sorting process is done manually using a gancu tool. At initial observation, it appears that workers have a poor working position so there is a musculoskeletal risk, so that data collection will be carried out using the Nordic Body Map Questionnaire, interviews, and documentation in the form of photos of the operator while working. Musculoskeletal risks were observed in several areas of the body, such as the back, waist, neck, upper arms, forearms, and wrists. Body posture analysis using Rapid Entire Body Assessment (REBA) and Rapid Upper Limb Assessment (RULA) methods was used in this study. The REBA method is used to analyze the lower and upper body postures, while the RULA method is to analyze the lower body postures. In the REBA analysis results obtained a score of 10 with a very high level of risk while RULA obtained a score of 7 with a high level of risk. Provision of repair solutions is carried out on sorting operators, namely changing body posture while working and suggestions for repairing work tools. At the analysis stage of improving posture, the REBA score fell to 7 with a mod.

ANALISIS PERENCANAAN DAN PENGENDALIAN PERSEDIAAN DENGAN MENGGUNAKAN METODE ECONOMIC ORDER QUANTITY (EOQ) DAN PERIOD ORDER QUANTITY (POQ)

Sat, 30 Apr 2022 00:00:00 +0000

Supplies are always needed by every company, both small companies, and large inventories. Without an inventory of raw materials, the company is faced with the risk that one day the company will not be able to meet the needs of consumers. The purpose of this study is to determine the amount of raw material purchased at each message with the lowest cost and find out the right time period to place an order for raw materials by calculating with the raw method. The data studied is in the form of data on raw material needs, data on ordering costs, storage costs, frequency of raw material purchases, and the amount of raw material purchases during 2021. The approach used is the Economic Order Quantity (EOQ) and Period Order Quantity (POQ) Methods. Meanwhile, the calculation using the POQ method is lower than the company's policy, with the purchase of raw materials as many as 1,170 pallets with a frequency of 6 times, and 34 pieces of plywood with an order period made 10 times a year with a total inventory cost that must be spent of Rp. 4,581,178, or only 26% of the current method carried out by the company. By using the POQ method, the company can save inventory costs of Rp. 12,964,990. and safety supplies of 56 pallets and 6 sheets of plywood and re-ordered when the raw materials amounted to 1,296 pallets and 33 sheets of plywood. Based on the conclusions above, the author advises companies to consider using the POQ method to determine the need for raw materials needed.

PERBANDINGAN METODE SHARED STORAGE DAN METODE DEDICATED STORAGE PADA PENEMPATAN DAN PENYUSUNAN BARANG DI GUDANG SPAREPARTS PT INDONESAI ASAHAN ALUMINIUM (PERSERO)

Sat, 30 Apr 2022 00:00:00 +0000

PT Indonesia Asahan Aluminium (Persero) is one of the State-Owned Enterprises (BUMN) engaged in aluminum smelting and is the only company engaged in the aluminum smelting industry in Indonesia. This research was conducted in the spare parts warehouse, where the problem is that the layout of the warehouse is still random and not neat, causing disruption of the storing issuing process and activities in the warehouse. Shared storage and dedicated storage is a methods of redesigning the storage layout to get a repair design. Then to get the optimum design results, the calculation results of the two methods are compared to obtain an efficient improvement design from the actual conditions. The results of the shared storage design obtained a mileage minimization of 1,133.18 m. Dedicated storage can minimize mileage by 394.59 m. This distance has decreased from the previous distance the initial layout distance was 5,639.00 m. So that the optimal method used is the shared storage method with a distance reduction of 4,505.82 m of material handling travel from the initial conditions. With this research, it is hoped that the spare parts warehouse will be neater and more organized so as to facilitate activities in storing and picking up goods, and can save used blocks.

Kajian Pondasi Sumuran pada Jembatan Bo'u Lahomi Kabupaten Nias Barat.

Rizky Franchitika, Kartika Indah Sari, Yustinus Y.P Gulo — Sat, 30 Apr 2022 00:00:00 +0000

The Bo'u Lahomi-West Nias Bridge is a bridge that spans 11.80 m. The sub-structure of the bridge consists of abutments and foundations. This evaluation was conducted to determine the bearing capacity of the well foundation and the safety factor against the working load along with an evaluation of the analysis of the amount of foundation reinforcement and pile cap. The safety factor for the bearing capacity of the well foundation is determined based on the comparison of the bearing capacity value of the well foundation > with the maximum load value that works on the foundation, while the safe factor for pile cap reinforcement and the well foundation is determined based on the strength value of the column > with the maximum load value received. In addition to field data, this analysis requires testing of soil parameters in the laboratory. The meters tested were specific gravity (Gs), filter analysis of moisture content, density, direct shear strength of the soil in the field. Based on the results of the analysis of the bearing capacity of the well foundation, it was found that the value of the bearing capacity of the pile foundation group was 2510,78 tons and the maximum load acting on the foundation was 1550,40 tons. 15 13, and shear reinforcement in the direction of X 10 – 140 and Y 10 – 100 and analysis of reinforcement on the well foundation obtained 35 D 19-250 principal reinforcement and spiral reinforcement 12 – 50 with a column strength of 7654.153 Ton > Pu = 1550.40 Tons, thus the bearing capacity of the well foundation on the bo'u bridge meets the requirements and is safe against the load received and the column cross-sectional design meets the requirements so that the size of the piles and reinforcement can be used.

Teoritikal Bentuk Bore Tsunami Menggunakan Metode Dambreak Dan Wavemaker Dengan Sistem DualSPHysics

Kartika Indah Sari, Yusrizal Lubis, Ditya Andrean Supit — Sat, 30 Apr 2022 00:00:00 +0000

A tsunami is a large water wave with the impact of damage and destruction on facilities and infrastructure when it spreads to the mainland. In general, a tsunami approaching the coast forms a bore wave when a single uniform (solitary) wave in a tsunami breaks when it enters the coast. This research was conducted to determine the transition process of tsunami waves to form a bore, as well as to determine the characteristics of the tsunami bore shape. The bore tsunami research was carried out using the dambreak and wavemaker methods using the DualSPHysics simulation computational program, the dimensions of the open channel at the dambreak were 20.7 m x 1.43 m x 1.5 m. The beach modeling on the dambreak has dimensions of 12.7 m x 0.64 m with a slope of 1:20. The channel dimensions on the wavemaker are 135 m x 2 m x 5 m. The wavemaker beach model has dimensions of 60 m x 3 m with a slope of 1:20. The total number of particles in the dambreak simulation is 24,638,764. The simulation results provide information that the bore wave is the result of the transition of a solitary wave breaking as it approaches the shoreline. The wave height that was formed at the beginning of the formation will continue to increase in height until it approaches the shoreline

Uji Penerapan Perbaikan Tanah Dasar Jenuh Air dengan Stabilitas Semen untuk Rekomendasi Desain Struktur Jalan di Kawasan Hamparan Perak Kab. Deli Serdang

M. Hadi Sofyan, Rizky Franchitika, Yudha Hanova — Sat, 30 Apr 2022 00:00:00 +0000

Roads are an important factor in supporting agricultural development and making it more efficient. In the construction of agricultural roads in Lama Village, Hamparan Perak District, Deli Serdang Regency, the presence of soft soil is one of the problems in the construction of farm road construction. Embankments built on soft subgrade without reinforcement will experience a slide. so that it is necessary to strengthen and improve the subgrade soil to prevent road sliding. This study aims to increase the carrying capacity of water-saturated soil on agricultural land in Lama Village, Hamparan Perak District, Deli Serdang Regency. The method used in research on the improvement and strengthening of the subgrade for farm roads is cement stabilization. The variations in cement content used were 3%, 4%, and 5%. The bearing capacity of subgrade and stabilized soil will be tested using a dynamic cone penetrometer (DCP). From the research results, it can be seen that the average CBR value of subgrade is 0.65%. From the results of the comparison of soil CBR values, soil stabilization with a cement percentage of 3% shows a CBR value of 5.51%, or 6%, fulfilling the requirements to increase soil carrying capacity according to MDP 2017, where the minimum subgrade CBR for pavement design is 6%.

STABILITAS TANAH GAMBUT MENGGUNAKAN KAPUR (CaO) DITINJAU DARI PENGUJIAN KUAT TEKAN BEBAS (UNCONFINED COMPRESSION TEST)

Diana Suita, Yusrizal Lubis — Sat, 30 Apr 2022 00:00:00 +0000

Organic soils pose many obstacles to the construction that will be built on it and are generally caused by physical properties of organic soils which have very high water content and low carrying capacity. The physical properties of a material will greatly affect the mechanical properties of the material as well as the organic soil. The mechanical properties of organic soils are very low, for example the value of free compressive strength (UCT). One method to increase the carrying capacity of the soil is by adding or mixing with materials that have a high soil carrying capacity. Adding lime to the sample in this study is expected to increase the carrying capacity of organic soil against free compressive strength (UCT). Then the sample is given the addition of lime with an additional percentage of 2%, 4%, 6%, 8%, 10% to see the comparison of the value of compressive strength (qu), after the addition of lime. The results of free compressive strength testing showed soil behavior in a sample condition with the addition of lime up to 10% experienced an increase in qu. The more the mixture of lime in the soil sample, the greater the value of free compressive strength (qu). In the original soil the value of free compressive strength (qu) was 0.837 kg / cm2, the soil was remoulded at 0.886 kg / cm2, and the free compressive strength (qu) at the addition of lime 10% was 1.132 kg / cm2.

Penentuan Jumlah Tenaga Kerja Yang Optimal Berdasarkan Waktu Standar Dengan Metode Work Sampling Di Bagian Penggulungan Di PT. PTPN IV

Sat, 30 Apr 2022 00:00:00 +0000

PTPN IV is a State-Owned Enterprise (BUMN) engaged in the agro-industry business which manages tea commodities covering 4% of the entire plantation business at PT. PTPN IV needs to determine the optimal number of workers at the rolling station, because there is an imbalance between working time and labor so that there are additions or reductions. The purpose of this study is to determine the amount of standard time, productivity and determine the number of workers to be employed at the rolling station based on standard time. Through this research, the company can determine the number of employees needed by the company to complete its work. This research was conducted from 07.00 WIB to 16.00 WIB for operators working in the rolling section to limit the problems in the research. The research took place in several stages, namely preliminary observation and then continued with determining the number of observations, work sampling observations, data collection, data processing, analysis of results, and conclusions from research results. This research was conducted using the work sampling method. This is done by observing the actions of workers while working, which is then used to measure their work productivity. By knowing the productivity of the operator, we get the standard work time and the number of productive hours to complete the job, then use it to calculate the total work time with the total processing of the enumeration from observations and calculations so that the number of workers who should be employed is known.

Pengendalian Persediaan Sparepart Sepeda Motor dengan Menggunakan Material Requirement Planning di CV. Parna Jaya Motor Indrapura

Sat, 30 Apr 2022 00:00:00 +0000

Inventory control is a company policy related to investment and service to consumers. CV. Parna Jaya Motor is a company engaged in the sale and repair of motorcycles. The problems that occur in this company are related to inventory controlspare partsthat causes consumer demand to bespare partsnot fulfilled. To overcome this, the company must be able to control inventoryspare partsso that consumer demand is fulfilled by applying the ABC Analysis method, then calculating the MRP to find out the number of orders (EOQ), order frequency (SS) and when to place an order again (ROP). The results of data processing using the method above obtained results for the ABC classification of 45 speciesspare parts,gotspare partsbelonging to class A consists of 13 speciesspare partswith an investment value of IDR 807,455,000 or 68% of the total investment, class B consists of 12 typesspare partswith an investment value of IDR 250,323,000 or 21% of the total investment and class C consisting of 20 typesspare partswith an investment value of IDR 127,266,000 or 11% of the total investment. Of 13 typesspare partsclass A which is a priority, EOQ results range from 28-293 units, F results range from 7-13 times/year, SS results range from 23-82 units, ROP results range from 95-303 units, and TC results everyspare partsranges from IDR 595,500 – IDR 1,075,200 with all TCspare partsRp. 10,101,900.

RANCANG BANGUN SISTEM KENDALI KELISTRIKAN MASJID AL-ISTIQOMAH MENGGUNAKAN PENERIMA HC-12 BERBASIS ARDUINO

Febriansyah Putra, Ali Hanafiah Rambe, Lisa Adriana Siregar — Sat, 30 Apr 2022 00:00:00 +0000

The current development of control and automatic system technology allows operators to easily turn on and off electronic devices remotely without having to make direct contact, this is very effective in saving time and helping one's work become easier. Currently electrical energy is a basic human need. However, the use of electrical energy is not used optimally, its use tends to be excessive, the cause is due to someone's negligence of an electrical device that forgot to turn it off. To overcome this problem, it is necessary to have an automatic control system that can control the switch to help minimize the waste of electrical energy. However, various kinds of automatic control system devices have drawbacks, including requiring an internet connection or using an SMS gateway so that they can be controlled remotely, which will increase spending on the budget for internet or credit needs every month. The method used in this design uses Arduino uno, HC – 12 module, ZMTC103C current sensor, and relay. This tool works when an instruction signal is received via the HC-12 module then the signal is forwarded to Arduino to turn on or turn off the electric device through a relay, the current sensor detects the condition of the electric device. From the results of testing the control system successfully turns on and off loads in the form of lights, fans, water pumps properly and can detect lights that go out.